Laplace transforms of Heavyside functions

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Discussion Overview

The discussion revolves around solving an ordinary differential equation (ODE) involving the Heaviside function using Laplace transforms. Participants explore the challenges posed by the product of functions in the context of Laplace transforms.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Homework-related

Main Points Raised

  • One participant presents the ODE y' = -y + 2*y*u(t-1) and seeks assistance with applying the Laplace transform.
  • Another participant notes that while the Heaviside function itself is straightforward, the lack of a simple formula for the Laplace transform of the product of two functions complicates the situation.
  • A later reply suggests that the Laplace transform may not be useful for differential equations with variable coefficients.
  • One participant proposes using separation of variables as an alternative technique to solve the problem.

Areas of Agreement / Disagreement

Participants express differing views on the applicability of Laplace transforms to the given ODE, with some suggesting alternative methods. No consensus is reached on the best approach.

Contextual Notes

The discussion highlights the limitations of Laplace transforms in handling products of functions and variable coefficients, but does not resolve the implications of these limitations.

logistics86
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Hi everyone,

I'm a long time lurker, first time poster and I was wondering if anyone could help me out with a little Laplace trouble i was having,

I am interested in solving the ODE

y' = -y+2*y*u(t-1)

where u is the heaviside function,

Any hints?
 
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logistics86 said:
Hi everyone,

I'm a long time lurker, first time poster and I was wondering if anyone could help me out with a little Laplace trouble i was having,

I am interested in solving the ODE

y' = -y+2*y*u(t-1)

where u is the heaviside function,

Any hints?

What do you get for the Laplace transform of that ODE?
 
The problem is NOT the Heaviside function- that's easy. The problem is that there is no simple formula for the Laplace transform of the product of two functions. The Laplace transform simply is not useful for differential equations with variable coefficients.
 
I thought that might be the case, can you suggest another technique I could look into to try and solve this sort of problem?
 
problem solved, separation of variables will do the trick really easily.
 

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